The Lavo Kingdom was a political entity (mandala) on the left bank of the Chao Phraya River in the Upper Chao Phraya valley from the end of Dvaravati civilization, in the 7th century, until 1388. The original center of Lavo civilization was Lavo (modern Lopburi), but the capital shifted southward to Ayodhaya, the port city on the right side of the Ayutthaya island around the 11th century, whereupon the state was incorporated into the Ayutthaya Kingdom in the 14th century. Dvaravati The area of Dvaravati (what is now Thailand) was first inhabited by Mon people who had arrived and appeared centuries earlier. The foundations of Buddhism in central Southeast Asia were laid between the 6th and 9th centuries when a Theravada Buddhist culture linked to the Mon people developed in central and northeastern Thailand. Theravadin Buddhists believe that Enlightenment can be obtained only by one living the life of a monk (and not by a layman). Unlike Mahayana Buddhists, who admit the texts of numerous Buddhas and Bodhisattvas into canon, Theravadans venerate only the Buddha Gautama, the founder of the religion. The Mon Buddhist kingdoms that rose in what are now parts of Laos and Central Plain of Thailand were collectively called Dvaravati. According to the Northern Thai Chronicles, Lavo was founded by Phraya Kalavarnadishraj, who came from Takkasila in 648 CE. According to Thai records, Phraya Kakabatr from Takkasila (it is assumed that the city was Tak or Nakhon Chai Si) set the new era, Chula Sakarat in 638 CE, which was the era used by the Siamese and the Burmese until the 19th century. His son, Phraya Kalavarnadishraj founded the city a decade later. King Kalavarnadishraj used the name "Lavo" as the name of the kingdom, which came from the Hindu name "Lavapura", meaning "city of Lava", in reference to the ancient South Asian city of Lavapuri (present-day Lahore). The only native language found during early Lavo times is the Mon language. However, there is debate whether Mon was the sole ethnicity of Lavo.